Provides access to a metadata query reader that can extract metadata from a bitmap image file.
Assembly: PresentationCore (in PresentationCore.dll)
query is a null reference (Nothing in Visual Basic).
Metadata that is associated with an image is data that describes the image but that is not necessary for display of the image. Each supported bitmap image format handles metadata differently, but the facility for reading and writing metadata is the same.
Windows Presentation Foundation (WPF) supports the following image metadata schemas: Exchangeable image file (Exif), tEXt (PNG Textual Data), image file directory (IFD), International Press Telecommunications Council (IPTC), and Extensible Metadata Platform (XMP).
The following code example demonstrates how to use the SetQuery method to write metadata to a Portable Network Graphics (PNG) file.
After the metadata is written, the method is used to read that data and emit it as a text string.